A tracer study of the formation, dispersal, and renewal of Levantine Intermediate Water
A tracer study of the formation, dispersal, and renewal of Levantine Intermediate Water
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黎凡特中层水的形成、扩散和更新的示踪研究
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
Richard G. Williams
中科院分区：
文献类型：
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作者：
K. Stratford;Richard G. Williams
地中海地中海中层水（LIW）的形成和扩散研究使用一系列的示踪剂实验的基础上的涡允许的大气环流模式。LIW形成于罗兹环流区，并通过时均环流和时变环流扩散。在罗兹环流中释放的示踪剂被时均环流向西输送，但也被时变环流向南和向东输送。离线示踪剂实验表明，时变环流同时具有平流分量和扩散分量，其中平流分量在某些地区对抗向下梯度传输。示踪剂侵入主温跃层的速率表明，更新时间尺度为10-20年的低水位和100年的顺序东地中海深水。假设平流主导示踪剂的输送，则隐含的年俯冲速率在罗兹环流中为0.6±0.1 Sv，在亚得里亚海中为0.2±0.1 Sv。LIW模式被发现成为冷却器和新鲜的结果与亚得里亚海外流混合，而其位涡似乎很好地保存。
The formation and dispersal of Levantine Intermediate Water (LIW) are examined using a series of tracer experiments based on an eddy-permitting general circulation model of the Mediterranean. LIW is formed in the region of the Rhodes gyre and disperses via both the time-mean and time-varying circulation. Tracer released in the Rhodes gyre is transferred westward by the time-mean circulation but also southward and eastward by the time-varying circulation. Off-line tracer experiments suggest that the time-varying circulation exhibits both advective and diffusive components, where the advective component opposes downgradient transfer in some regions. The rate of invasion of tracer into the main thermocline suggests that the renewal timescale is 10–20 years for LIW and of order 100 years for Eastern Mediterranean Deep Water. Assuming advection dominates the transfer of tracer, the implied annual subduction rate is 0.6±0.1 Sv in the Rhodes gyre and 0.2±0.1 Sv in the Adriatic Sea. The LIW mode is found to become cooler and fresher as a result of mixing with the Adriatic outflow, while its potential vorticity appears well conserved.